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</a></div> <!----></nav> <ul class="sidebar-links"><li><a href="/blog-666group/blogs/fanzhixuan/one.html" class="sidebar-link">js数组的基本方法</a></li><li><a href="/blog-666group/blogs/fanzhixuan/two.html" aria-current="page" class="active sidebar-link">js的循环机制、宏观任务与微观任务</a></li></ul> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-25ba6db2 data-v-1aefc0b4><h3 class="title" data-v-25ba6db2 data-v-25ba6db2>js的循环机制、宏观任务与微观任务</h3> <!----> <label id="box" class="inputBox" data-v-25ba6db2 data-v-25ba6db2><input type="password" value="" data-v-25ba6db2> <span data-v-25ba6db2>Konck! Knock!</span> <button data-v-25ba6db2>OK</button></label> <div class="footer" data-v-25ba6db2 data-v-25ba6db2><span data-v-25ba6db2><i class="iconfont reco-theme" data-v-25ba6db2></i> <a target="blank" href="https://vuepress-theme-reco.recoluan.com" data-v-25ba6db2>vuePress-theme-reco</a></span> <span data-v-25ba6db2><i class="iconfont reco-copyright" data-v-25ba6db2></i> <a data-v-25ba6db2><span data-v-25ba6db2>666</span>
            
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        </a></span></div></div> <div data-v-1aefc0b4><main class="page"><section><div class="page-title"><h1 class="title">js的循环机制、宏观任务与微观任务</h1> <div data-v-f875f3fc><i class="iconfont reco-account" data-v-f875f3fc><span data-v-f875f3fc>666</span></i> <i class="iconfont reco-date" data-v-f875f3fc><span data-v-f875f3fc>2020/8/23</span></i> <!----> <i class="tags iconfont reco-tag" data-v-f875f3fc><span class="tag-item" data-v-f875f3fc>js</span></i></div></div> <div class="theme-reco-content content__default"><hr> <h3 id="js的循环机制、宏观任务与微观任务"><a href="#js的循环机制、宏观任务与微观任务" class="header-anchor">#</a> js的循环机制、宏观任务与微观任务</h3> <p>javascript是单线程语言，EventLoop事件循环。</p> <p>一、同步和异步：</p> <p>所有的线程，都是有同步队列，和异步队列，立即执行的任务队列，这些都是属于同步任务，比如一个简单的函数；请求接口发送ajax，发送promise，或时间计时器等等，这些就是异步任务。</p> <p>二、任务队列-事件循环：</p> <p>同步任务会立刻执行，进入到主线程当中，异步任务会被放到任务队列当中。</p> <p>等待同步代码执行完毕后，返回来，再将异步中的任务放到主线程中执行，反复这样的循环，这就是事件循环。</p> <p>也就是先执行同步，返回来按照异步的顺序再次执行。</p> <p>三、宏观任务和微观任务（先执行微观任务，再执行宏观任务）</p> <p>在事件循环中，每进行一次循环操作称为tick，tick 的任务处理模型是比较复杂的，里边有两个词：分别是 Macro Task （宏任务）和 Micro Task（微任务）。</p> <p>简单来说：</p> <p>宏观任务主要包含：setTimeout、setInterval、script(整体代码)、I/O、UI 交互事件、setImmediate(Node.js 环境)</p> <p>微观任务主要包括：Promise、MutaionObserver、process.nextTick(Node.js 环境)</p> <p>规范：先执行微观任务，再执行宏观任务</p> <p>那么我们知道了，Promise 属于微观任务， setTimeout、setInterval 属于宏观任务，先执行微观任务，等微观任务执行完，再执行宏观任务。</p> <p>案例一：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'开始111'</span><span class="token punctuation">)</span>

<span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'setTimeout111'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span>

Promise<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'promise111'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'promise222'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'开始222'</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p>猜想：</p> <p>先走同步的代码，从上往下，先打印 “开始111”，再打印“开始222”。</p> <p>中途的三个异步，进入到了异步队列，等待同步执行完（打印完），返回来再执行异步，所以是后打印出来。</p> <p>分析：</p> <p>1、遇到同步任务，直接先打印 “开始111”。</p> <p>2、遇到异步 setTimeout ，先放到队列中等待执行。</p> <p>3、遇到了 Promise ，放到等待队列中。</p> <p>4、遇到同步任务，直接打印 “开始222”。</p> <p>5、同步执行完，返回执行队列中的代码，从上往下执行，发现有宏观任务setTimeout 和微观任务Promise ，那么先执行微观任务，再执行宏观任务。</p> <p>所以打印的顺序为： 开始111 、开始222 、 promise111 、 promise222 、 setTimeout111</p> <p>案例二：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'开始111'</span><span class="token punctuation">)</span>

<span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'timeout111'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token parameter">resolve</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'promise111'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'timeout222'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'promise222'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'开始222'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><p>分析：</p> <p>1、遇到同步代码，先打印 “开始111” 。</p> <p>2、遇到setTimeout异步，放入队列，等待执行 。</p> <p>3、中途遇到Promise函数，函数直接执行，打印 “promise111”。</p> <p>4、遇到setTimeout ，属于异步，放入队列，等待执行。</p> <p>5、遇到Promise的then等待成功返回，异步，放入队列。</p> <p>6、遇到同步，打印 “开始222”。</p> <p>7、执行完，返回，将异步队列中的代码，按顺序执行。有一个微观任务，then后的，所以打印 “promise222”，再执行两个宏观任务 “timeout111” “timeout222”。</p> <p>所以，打印的顺序为：开始111 、 promise111 、 开始222 、 promise222 、 timeout111 、 timeout222</p> <p>先执行主任务，把异步任务放入循环队列当中，等待主任务执行完，再执行队列中的异步任务。异步任务先执行微观任务，再执行宏观任务。一直这样循环，反复执行，就是事件循环机制。</p></div></section> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated: </span> <span class="time">2022/2/8 下午8:56:42</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"><a href="/blog-666group/blogs/fanzhixuan/one.html" class="prev">
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